• 제목/요약/키워드: lot기술

검색결과 1,937건 처리시간 0.032초

동작시간분석에 의한 작업개선연구 -PCB조립작업을 사례로- (A Work Improvement Study by Motion-Time Analysis)

  • 박성학
    • 기술사
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    • 제16권3호
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    • pp.33-40
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    • 1983
  • This paper is one of the case studies to improve the labor productivity of PCB assembly through Work Factor motion-time analysis and the application of the motion economy principles and the human factors engineering theory. In result, we can improve 129% of the labor productivity by using a rotary table for the parts delivery. Therefore, it is expected that this result can be used for a lot of the manual works of the small and medium-sized industries especially.

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긴급제언 - 신재생에너지와 바이오가스 (Urgent Proposal - Renewable energy & Biogas)

  • 김영섭
    • 기술사
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    • 제44권6호
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    • pp.35-39
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    • 2011
  • Many countries around the world have actively used biogas to reduce greenhouse gases in order to improve the environment. Recently, South Korea has invested a lot of money in technology development for organic waste and expanded the policy to supply renewable energy. The use of biogas would also increase our country's energy security. Therefore, I would suggest that our government adopt the relevant laws and systems regarding biogas in the near future.

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Improved Inference for Human Attribute Recognition using Historical Video Frames

  • Ha, Hoang Van;Lee, Jong Weon;Park, Chun-Su
    • 반도체디스플레이기술학회지
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    • 제20권3호
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    • pp.120-124
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    • 2021
  • Recently, human attribute recognition (HAR) attracts a lot of attention due to its wide application in video surveillance systems. Recent deep-learning-based solutions for HAR require time-consuming training processes. In this paper, we propose a post-processing technique that utilizes the historical video frames to improve prediction results without invoking re-training or modifying existing deep-learning-based classifiers. Experiment results on a large-scale benchmark dataset show the effectiveness of our proposed method.

오픈 소스 프레임워크를 활용한 검색엔진 구현 (Implement on Search Machine using Open Source Framework)

  • 송현옥;김아용;정회경
    • 한국정보통신학회논문지
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    • 제19권3호
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    • pp.552-557
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    • 2015
  • IT 기술 발전과 스마트 기기들의 사용 증가로 인해 인터넷에서는 많은 데이터가 생산되고 소비된다. 이로 인해 정보 검색 기술의 중요성이 높아지고 있지만 정보 검색 기술은 많은 배경 지식을 요구하여 접근하기 어려운 기술로 인식되고 있다. 그러나 Luene의 등장으로 인해 검색 기술에 대한 배경 지식이 부족해도 Lucene을 사용하여 검색 엔진을 구현할 수 있는 배경을 마련되었다. 본 논문에서는 Lucene 기반으로 개발된 프레임워크들을 사용하여 검색엔진을 구현하는 방법에 대해 제안한다. 제안하는 검색엔진에 사용되는 프레임워크들은 Hadoop과 Nutch, Solr, Zookeeper를 사용하여 분산처리와 분산저장, 그리고 고가용성을 지원하는 서버 환경을 보장한다.

경기력 수준에 따른 낙관성의 차이: 배드민턴 청소년 대표선수를 대상으로 (Difference of optimism according to the level of performance: For the Korean badminton national youth players)

  • 김덕진
    • 문화기술의 융합
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    • 제6권1호
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    • pp.179-183
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    • 2020
  • Seligman은 미국 프로야구와 프로농구 선수들을 대상으로 실시한 연구결과를 근거로 낙관적인 운동선수가 승리한다고 주장한다(최호영 역, 2008). 이에 본 연구는 낙관성으로 배드민턴 청소년 대표선수들의 경기력을 예측할 수 있는지 알아보기 위하여 수행되었다. 고등학생 대표 60명을 경기력 상, 하 두 집단으로 구분하여 그들의 낙관성에 차이가 있는가를 알아보았다. 검사도구로는 Scheier, Carver 및 Bridges(1994)가 개발하고 신현숙(2005)이 번안한 삶의 지향성 검사 개정판(LOT-R : Revised Life Orientation Test)을 사용하였고 빈도분석, 신뢰도 분석, 독립 t검증을 실시하여 자료를 분석하였다. 그 결과, 경기력 상집단이 하집단에 비해서 낙관성이 통계적으로 유의미하게 높은 것으로 나타났다. 따라서 경기력을 향상시키기 위해서는 체력훈련, 기술연습과 동시에 낙관성을 향상시킬 수 있는 심리기술훈련이 필요하겠다.

새만금방조제 건설로 인한 전라북도 형망어업의 변천과정 (The historical process of dredge fishery according to the construction of the Saemangeum Dike in Jeollabuk-do, Korea)

  • 최종덕;류동기
    • 수산해양기술연구
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    • 제53권4호
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    • pp.327-336
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    • 2017
  • Fishing dredge in Jeollabuk-do began to become widespread in the 1960s and has continued to catch diverse kinds of shellfish in the productive fishing grounds around Dongjin River, Mangyeong River and Geum River estuaries. Since the 1970s, the construction of various large-scale industrial complex and the implementation of Saemangeum reclamation project have resulted in a decrease in main fishing areas and a sharp decline in shellfish production. As a result, dredge fishery has faced many difficulties. Dredge fishery in Jeollabuk-do is carried out with a total of 30 fishing permits as of 2016. Surf clams, hen clams, bladder moon snails, and common orient clams were mainly caught before the construction of Saemangeum dike while comb pen shells, purple whelks and ark shells are mainly caught afterwards. Inside the Saemangeum dike, most fish species have disappeared due to low water level and low salinity, and littleneck clams are caught using a jet pump type of fishing dredge. Outside the dike, the diversity of shellfish species has been reduced; comb pen shells are mainly caught. In this process, a lot of friction occurs due to the use of a reformatted dredge. Therefore, a lot of research needs to be conducted in the near future.

역공학을 통한 설계교육 방법론 (A Methodology of machine design through reverse engineering)

  • 편영식;이건범
    • 한국산학기술학회:학술대회논문집
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    • 한국산학기술학회 2001년도 추계산학기술 심포지엄 및 학술대회 발표논문집
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    • pp.107-110
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    • 2001
  • Design process is the essential technology for development of industry in nation, but contrary to its significance the trial for development of design technology is not so active because it requires a lot of time and efforts to educate design engineers. For that reason, most of enterprises concentrated their efforts for improving product technologies to get instant effects in short periods, and through these trials considerable results could be achieved. Recently, however, many people realized that industrial development through only product technology without design technology has limits, accordingly, a lot of efforts, to educate machine designers whom have enough knowledge and ability on design through advanced design technology, concentrated for industrial development. In general, the curriculum of conventional education for machine design in most universities is mainly compose of three subjects, the theory for elements design, geometric modeling practice for mating engineering drawings using CAD software, and analysis of elements using CAE software fur determining whether proposed solution is correct or rational. Furthermore, because these three subject are provided for students as the completely separated subjects, most of students who have educated with this method have no enough ability to Integrate all design process into a comprehensive whole process. This paper proposes a new design education methodology through reverse engineering that can overcome these problems of conventional education method.

높은 세장비를 가진 복합재 날개 구조의 효율적인 고기능 설계를 위한 구조해석 해석 라이브러리 개발 (Structural Analysis Library Development for Efficient High-Fidelity Composite Rotor Blade and Wing Design with High Aspect Ratio)

  • 박제홍;장준환
    • 한국군사과학기술학회지
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    • 제22권4호
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    • pp.460-466
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    • 2019
  • It takes a lot of time and human resources to build a detailed three-dimensional finite element analysis model that is almost similar to the actual structure for sophisticated analysis, and a lot of experience and know-how is required to form a reliable analytical model. In this paper, the one-dimensional beam model connected by stiffness matrix through blade analysis library was compared with the results of three-dimensional analysis with the stress calculated through the process of dimensional restoration analysis based on the principle of virtual work. By comparing the stress calculated through dimensional restoration analysis with the three-dimensional analytical model, We will introduce the development status and application case of the blade analysis library by comparing efficiency and accuracy.

경량 딥러닝 가속기를 위한 희소 행렬 압축 기법 및 하드웨어 설계 (Sparse Matrix Compression Technique and Hardware Design for Lightweight Deep Learning Accelerators)

  • 김선희;신동엽;임용석
    • 디지털산업정보학회논문지
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    • 제17권4호
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    • pp.53-62
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    • 2021
  • Deep learning models such as convolutional neural networks and recurrent neual networks process a huge amounts of data, so they require a lot of storage and consume a lot of time and power due to memory access. Recently, research is being conducted to reduce memory usage and access by compressing data using the feature that many of deep learning data are highly sparse and localized. In this paper, we propose a compression-decompression method of storing only the non-zero data and the location information of the non-zero data excluding zero data. In order to make the location information of non-zero data, the matrix data is divided into sections uniformly. And whether there is non-zero data in the corresponding section is indicated. In this case, section division is not executed only once, but repeatedly executed, and location information is stored in each step. Therefore, it can be properly compressed according to the ratio and distribution of zero data. In addition, we propose a hardware structure that enables compression and decompression without complex operations. It was designed and verified with Verilog, and it was confirmed that it can be used in hardware deep learning accelerators.

토모테라피에서 통계적공정관리를 이용한 EBT 필름 기반의 선량품질보증의 치료계획 가이드라인 (Treatment Planning Guideline of EBT Film-based Delivery Quality Assurance Using Statistical Process Control in Helical Tomotherapy)

  • 장경환
    • 대한방사선기술학회지:방사선기술과학
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    • 제45권5호
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    • pp.439-448
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    • 2022
  • The purpose of this study was to analyze the results from statistical process control (SPC) to recommend upper and lower control limits for planning parameters based on delivery quality assurance (DQA) results and establish our institutional guidelines regarding planning parameters for helical tomotherapy (HT). A total of 53 brain, 41 head and neck (H & N), and 51 pelvis cases who had passing or failing DQA measurements were selected. The absolute point dose difference (DD) and the global gamma passing rate (GPR) for all patients were analyzed. Control charts were used to evaluate upper and lower control limits (UCL and LCL) for all assessed treatment planning parameters. Treatment planning parameters were analyzed to provide its range for DQA pass cases. We confirmed that the probability of DQA failure was higher when the proportion of leaf open time (LOT) below 100 ms was greater than 30%. LOT and gantry period (GP) were significant predictor for DQA failure using the SPC method. We investigated the availability of the SPC statistic method to establish the local planning guideline based on DQA results for HT system. The guideline of each planning parameter in HT may assist in the prediction of DQA failure using the SPC statistic method in the future.